When The Bough Breaks: Season 4, Episode 12

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Ultimately the group decides that to fix the Harker's problem, Duke had to use his Trouble to kill a Harker – in this case the baby's father – to end the Harker family curse. Since Duke no longer had his Trouble, Audrey "re-troubled" him. When Audrey touched Duke's chest to reactivate his Trouble, not only did she bring back Duke's abilities, she also remembered who she really was: Mara, who William once loved and who was totally evil.